c++:   - one global static rng per thread   - fix for transpose error   - fix error in chi generator of wishart unit
c++:
  - one global static rng per thread
  - fix for transpose error
  - fix error in chi generator of wishart unit

ExaScience/bpmf,ExaScience/bpmf,jaak-s/bpmf,jaak-s/bpmf,ExaScience/bpmf,ExaScience/bpmf,ExaScience/bpmf